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Diffstat (limited to '')
| -rw-r--r-- | src/global/normalize_mailhost_addr.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/src/global/normalize_mailhost_addr.c b/src/global/normalize_mailhost_addr.c new file mode 100644 index 0000000..d60135f --- /dev/null +++ b/src/global/normalize_mailhost_addr.c @@ -0,0 +1,259 @@ +/*++ +/* NAME +/* normalize_mailhost_addr 3 +/* SUMMARY +/* normalize mailhost address string representation +/* SYNOPSIS +/* #include <normalize_mailhost_addr.h> +/* +/* int normalize_mailhost_addr( +/* const char *string, +/* char **mailhost_addr, +/* char **bare_addr, +/* int *addr_family) +/* DESCRIPTION +/* normalize_mailhost_addr() takes the RFC 2821 string +/* representation of an IPv4 or IPv6 network address, and +/* normalizes the "IPv6:" prefix and numeric form. An IPv6 or +/* IPv4 form is rejected if supposed for that protocol is +/* disabled or non-existent. If both IPv6 and IPv4 support are +/* enabled, a V4-in-V6 address is replaced with the IPv4 form. +/* +/* Arguments: +/* .IP string +/* Null-terminated string with the RFC 2821 string representation +/* of an IPv4 or IPv6 network address. +/* .IP mailhost_addr +/* Null pointer, or pointer to null-terminated string with the +/* normalized RFC 2821 string representation of an IPv4 or +/* IPv6 network address. Storage must be freed with myfree(). +/* .IP bare_addr +/* Null pointer, or pointer to null-terminated string with the +/* numeric address without prefix, such as "IPv6:". Storage +/* must be freed with myfree(). +/* .IP addr_family +/* Null pointer, or pointer to integer for storing the address +/* family. +/* DIAGNISTICS +/* normalize_mailhost_addr() returns -1 if the input is malformed, +/* zero otherwise. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* Google, Inc. +/* 111 8th Avenue +/* New York, NY 10011, USA +/*--*/ + + /* + * System library. + */ +#include <sys_defs.h> +#include <string.h> + +#ifdef STRCASECMP_IN_STRINGS_H +#include <strings.h> +#endif + + /* + * Utility library. + */ +#include <inet_proto.h> +#include <msg.h> +#include <myaddrinfo.h> +#include <mymalloc.h> +#include <stringops.h> + + /* + * Global library. + */ +#include <normalize_mailhost_addr.h> +#include <valid_mailhost_addr.h> + +/* normalize_mailhost_addr - parse and normalize mailhost IP address */ + +int normalize_mailhost_addr(const char *string, char **mailhost_addr, + char **bare_addr, int *addr_family) +{ + const char myname[] = "normalize_mailhost_addr"; + INET_PROTO_INFO *proto_info = inet_proto_info(); + struct addrinfo *res = 0; + MAI_HOSTADDR_STR hostaddr; + const char *valid_addr; /* IPv6:fc00::1 */ + const char *normal_addr; /* 192.168.0.1 */ + int normal_family; + +#define UPDATE_BARE_ADDR(s, v) do { \ + if (s) myfree(s); \ + (s) = mystrdup(v); \ + } while(0) +#define UPDATE_MAILHOST_ADDR(s, prefix, addr) do { \ + if (s) myfree(s); \ + (s) = concatenate((prefix), (addr), (char *) 0); \ + } while (0) + + /* + * Parse and normalize the input. + */ + if ((valid_addr = valid_mailhost_addr(string, DONT_GRIPE)) == 0 + || hostaddr_to_sockaddr(valid_addr, (char *) 0, 0, &res) != 0 + || sockaddr_to_hostaddr(res->ai_addr, res->ai_addrlen, + &hostaddr, (MAI_SERVPORT_STR *) 0, 0) != 0) { + normal_addr = 0; +#ifdef HAS_IPV6 + } else if (res->ai_family == AF_INET6 + && strncasecmp("::ffff:", hostaddr.buf, 7) == 0 + && strchr((char *) proto_info->sa_family_list, AF_INET)) { + normal_addr = hostaddr.buf + 7; + normal_family = AF_INET; +#endif + } else if (strchr((char *) proto_info->sa_family_list, res->ai_family)) { + normal_addr = hostaddr.buf; + normal_family = res->ai_family; + } else { + normal_addr = 0; + } + if (res) + freeaddrinfo(res); + if (normal_addr == 0) + return (-1); + + /* + * Write the applicable outputs. + */ + if (bare_addr) { + UPDATE_BARE_ADDR(*bare_addr, normal_addr); + if (msg_verbose) + msg_info("%s: bare_addr=%s", myname, *bare_addr); + } + if (mailhost_addr) { +#ifdef HAS_IPV6 + if (normal_family == AF_INET6) + UPDATE_MAILHOST_ADDR(*mailhost_addr, IPV6_COL, normal_addr); + else +#endif + UPDATE_BARE_ADDR(*mailhost_addr, normal_addr); + if (msg_verbose) + msg_info("%s: mailhost_addr=%s", myname, *mailhost_addr); + } + if (addr_family) { + *addr_family = normal_family; + if (msg_verbose) + msg_info("%s: addr_family=%s", myname, + *addr_family == AF_INET6 ? "AF_INET6" + : *addr_family == AF_INET ? "AF_INET" + : "unknown"); + } + return (0); +} + + /* + * Test program. + */ +#ifdef TEST +#include <stdlib.h> +#include <mymalloc.h> +#include <msg.h> + + /* + * Main test program. + */ +int main(int argc, char **argv) +{ + /* Test cases with inputs and expected outputs. */ + typedef struct TEST_CASE { + const char *inet_protocols; + const char *mailhost_addr; + int exp_return; + const char *exp_mailhost_addr; + char *exp_bare_addr; + int exp_addr_family; + } TEST_CASE; + static TEST_CASE test_cases[] = { + /* IPv4 in IPv6. */ + {"ipv4, ipv6", "ipv6:::ffff:1.2.3.4", 0, "1.2.3.4", "1.2.3.4", AF_INET}, + {"ipv6", "ipv6:::ffff:1.2.3.4", 0, "IPv6:::ffff:1.2.3.4", "::ffff:1.2.3.4", AF_INET6}, + /* Pass IPv4 or IPV6. */ + {"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", "fc00::1", AF_INET6}, + {"ipv4, ipv6", "1.2.3.4", 0, "1.2.3.4", "1.2.3.4", AF_INET}, + /* Normalize IPv4 or IPV6. */ + {"ipv4, ipv6", "ipv6:fc00::0", 0, "IPv6:fc00::", "fc00::", AF_INET6}, + {"ipv4, ipv6", "01.02.03.04", 0, "1.2.3.4", "1.2.3.4", AF_INET}, + /* Suppress specific outputs. */ + {"ipv4, ipv6", "ipv6:fc00::1", 0, 0, "fc00::1", AF_INET6}, + {"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", 0, AF_INET6}, + {"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", "fc00::1", -1}, + /* Address type mismatch. */ + {"ipv4, ipv6", "::ffff:1.2.3.4", -1}, + {"ipv4", "ipv6:fc00::1", -1}, + {"ipv6", "1.2.3.4", -1}, + 0, + }; + TEST_CASE *test_case; + + /* Actual results. */ + int act_return; + char *act_mailhost_addr = mystrdup("initial_mailhost_addr"); + char *act_bare_addr = mystrdup("initial_bare_addr"); + int act_addr_family = 0xdeadbeef; + + /* Findings. */ + int tests_failed = 0; + int test_failed; + + for (tests_failed = 0, test_case = test_cases; test_case->inet_protocols; + tests_failed += test_failed, test_case++) { + test_failed = 0; + inet_proto_init(argv[0], test_case->inet_protocols); + act_return = + normalize_mailhost_addr(test_case->mailhost_addr, + test_case->exp_mailhost_addr ? + &act_mailhost_addr : (char **) 0, + test_case->exp_bare_addr ? + &act_bare_addr : (char **) 0, + test_case->exp_addr_family >= 0 ? + &act_addr_family : (int *) 0); + if (act_return != test_case->exp_return) { + msg_warn("test case %d return expected=%d actual=%d", + (int) (test_case - test_cases), + test_case->exp_return, act_return); + test_failed = 1; + continue; + } + if (test_case->exp_return != 0) + continue; + if (test_case->exp_mailhost_addr + && strcmp(test_case->exp_mailhost_addr, act_mailhost_addr)) { + msg_warn("test case %d mailhost_addr expected=%s actual=%s", + (int) (test_case - test_cases), + test_case->exp_mailhost_addr, act_mailhost_addr); + test_failed = 1; + } + if (test_case->exp_bare_addr + && strcmp(test_case->exp_bare_addr, act_bare_addr)) { + msg_warn("test case %d bare_addr expected=%s actual=%s", + (int) (test_case - test_cases), + test_case->exp_bare_addr, act_bare_addr); + test_failed = 1; + } + if (test_case->exp_addr_family >= 0 + && test_case->exp_addr_family != act_addr_family) { + msg_warn("test case %d addr_family expected=0x%x actual=0x%x", + (int) (test_case - test_cases), + test_case->exp_addr_family, act_addr_family); + test_failed = 1; + } + } + if (act_mailhost_addr) + myfree(act_mailhost_addr); + if (act_bare_addr) + myfree(act_bare_addr); + if (tests_failed) + msg_info("tests failed: %d", tests_failed); + exit(tests_failed != 0); +} + +#endif |